/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: fzykd
 * Date: 2023-05-11
 * Time: 15:58
 */

//投影仪
public class Projector {

    private static Projector instance = new Projector();

    public static Projector getInstance(){
        return instance;
    }

    public void on(){
        System.out.println(" project on");
    }

    public void off(){
        System.out.println(" project off");
    }

    public void focus(){
        System.out.println("投影仪正在聚焦");
    }



}
